Sand-blast machine



July 24, 1923. 31A-62,786

D. P. CLEVELAND l SAND, BLAST MACHINE Filed March 20, 1922 'Q k 'ff Patented July 24, 1923.

iran STATES DAVID P. CLEVELAND, OF DALLAS, TEXAS, ASSIGNOR 0F SNE-HALF TO J'. A. BERG- EELD, OF DALIMLLS,` TEXAS.

seien-BLAST MAoHiNE.

Application ined Marca eo, i922. serial no. 545,008.

To all whom t may concern:

` Be it known that I', DAVID P. CLEVELAND,

a citizen of the United States, residing at Dallas, in the county of Dallas and State of rlexas, have invented certain new and useful `improvements inSand-Blast Machines, of

which the following is a specification.

This invention relates to new and useful improvements in sand blast machines.

The invention contemplates a machine adapted todeliver a blast of sand for treating the surfaces of various objects orfor re moving the finish therefrom; and has for its primary object the provision of'means which obviatethe necessity of'drying the sand or breaking it up before placing the same in the machine.

Another'object resides in the provision of an agitating device co-operating with a turbine, .whereby the sand is thoroughly 4broken up! and dried inthe machine before being discharged.l

Another feature resides-in a by-passair line" for creating a vacuum in the discharge line and thereby promoting the blast.

A constructiongdesigned to carryout ythe invention will `be hereinafter described togetherA withvother features of the invention.

The invention will be more readily understood from a reading of the following specication and by reference to the accompanying drawings, in `which an example of the invention is shown andwherein:

Fig. 1 is a side elevation Aof a machine constructed in accordance with my invention, and being partly in section to showr internal parts, i

Fig. 2 is a vertical sectional View taken on the line 2-2 of Fig. 1, and

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 1, showing the agitating device. n

In the drawings the numeral 10 designates a substantially drum-'like housing which is provided with a removable plate 11 secured thereto by screws 12 or the like. rlhelower portion of the housing opposite the plate is inclined rearwardly to form a chute 13, above which said housing merges into a hopper 14, the wall 15 forming a barrier between the hopper and the said housing. The'hopper is separated from the chute 13 by a bottom 16 in. which is provided a plurality -of transverse slots 17 spaced apart and parallel to each other.

Ashaft 18 extends thru the housing and the said chute 13, one end being journaled in a bearing 19 in the center of the plate 11 and provided with a packing box 20. The other end is supported in a bearing 21 and extends thru a packing box 22, so that a pulley 23 may be mounted thereon.

turbine composed of a plurality of radial vanes 24 is mounted on the shaft 18 so as to revolve in the housing 10. The said vanes are preferably bent transversely in the middle so as to be angular or V-shaped in construction, the extreme outer edges of the same being curved slightly inwardly of the angle, as is best seen in Fig. 2. The lowerfportion of the housing 10 formsan air channel 25 which is substantially tangential to the path of the turbine. As is best shown in Fig. 2, oneendof the said channel Vis open forming a mouth 26 into which a stream of air may be directed from a noz-` zle 27 in alinement therewith. The nozzle is in close proximity to the mouth of said channel and forms a part of an air line 28 which may be connected with any suitable source of compressed air, as is obvious. A control valve 29 is alsoincluded in said line to regulate the flow of air thru said nozzle. It will be readily seen that a stream of air discharged from the nozzle 27 under pressure will strike the concave or inner side of the vanes 24 and thereby drive the turbine together with the shaft 18.

A by-pass air line 30 extends from the line 28 and enters the opposite end of the channel 25 thruthe base 10 of the housing. The said line 30 is provided with an outwardl directed jet 31 at rightangles thereto, whicli together with a sleeve 32, composes a nozzle to which the discharge line is connected. As is obvious, the said sleeve is mounted in the end of the said channel concentrically to the jet 31, `and has a flaring inner end; a flexible conductor such as rubber hose 33 being con- In operation sand is placed inthe hopper 1&4, and the valve 29 is opened so as to direct y a stream of air under high pressure against the blades 24, thus revolving the turbine and the shaft 18. The lingers 31 passii'ig thru the slots 17 break up the sand inthe bottom of the hopper so as to admit the same into the chute 13 thru said slots. The sand admitted is thus delivered into the channel 25 Where it is further agitated by the blades 24.

The action of the revolving turbine together It is pointed out that a machine construct ed in accordance with the invention obvialtes the necessity of treating thesand before placing it therein. i Sand in the bottom of the hopper is broken up primarily by the fingers 34 and admitted thru the slots 17. When coming in contact with the revolving turbine and air the said sand is further broken up and dried, as has been clearly set forth. l

If at any time it is found desirable to drive the turbine and shaft by power other than the air pressure, it is obvious that said power may be transmitted by means of al belt and the pulley 23. h i l A Various changes in the size and shape of the different parts as well as `modifications may be made, Without departing fromv the spirit of the invention.

vWhat I claim, is: y v

1. In asand blast machine, a hopper, a turbine, a housing enclosing the turbine, said housing having means for admitting a fluid under pressure for driving said turbine, means coeoperating with said turbine for agitating vthe sand in the hopper and causing the sameto precipitate into said housing, and means for discharging said fluid and sand from said housing.

2. In a sand blast machine, a. turbine, a housing enclosing the turbine and'having a chute extending from one side, a hopper ar- 'angcd abovethe chute and being separated therefrom `by a bottom, said bottom being provided with a plurality of elongated slots, said turbine being mounted Von a shaft having one end extending1 thru the said chute, means on the shaft adapted to pass thruthe said slots and agitatethesand When the said shaft is revolved, means for admitting a fluid underpressure for driving said turbine, and means for discharging saidfiiuid and sand from the housing. v Q

3. In a sand blast machine, a turbine, a housing enclosing the turbine, and having an air channel in its lower portion tangential to the path of the turbine, means `for delivering sand into the housing, means for directing a fluid under pressure into one end of the said channel` for driving the said.l turbine, and means at the opposite end ofthe channel for discharging said sandandfluid;`

In testimony whereof I aiiX my signature.

DAVID P.l CLEVELAND. 

